Band-cutter and feeder.



Patented May 8, I900.

No.- 649,l20.

N. WILSON. BAND CUTTER AND FEEDER.

(Application filed Dec. 8, 1899.)

4 Sheets-Shut I (No Model.)

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No. 649.!20. Patented May 8, I900.

J. N. WILSON.

BAND CUTTER AND FEEDEB.

(Application filed Dec. 8, 1899.) (No Modal.) 4 Sheeis-$heet 2.

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Patented May 8, I900.

J. N. WILSON. BAND CUTTER AND FEEDER.

(Application filed Dec. 8, 1899.)

4 Sheets-Shoat 3.

(No Model.)

P N 0 S L W l BAND CUTTER AND FEEDER.

(Application filed Dec. 8, 1899.)

4 Sheets-Sheet 4.

(No Model.)

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STATES I JAMES N. WVILSON, OF CEDAR FALLS, IOWVA, ASSIGNOR OFTWO-TIIIRDS TO GEORGE W. \VI'IITWORTH AND O. H. LEONARD, OF SAME PLACE.

BAND-CUTTER AND FEEDER.

SPECIFICATION forming part of Letters Patent No. 649,120, dated May 8,1900.

Application filed December S, 1899- Serial No. 739,603. (No model.)

To ctZZ whom it may concern:

Beit known that I, JAMES N. WVILSON, aoiti zen of the United States,residing at Cedar Falls, in the countyof Black Hawk and State of Iowa,have invented certain new anduseful Improvements in Band-Gutters andFeeders; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to band-cutters and feeders, and has for itsprimary object to se cure increased efficiency of action.

Another part of my purpose is to secure a band-cutter and feeder whichis of simple construction, comparatively compact and light of weight,and adapted for ready attachment to all kinds of threshing-machines.

To these ends myinven'tion consists of the novel devices andcombinations of devices hereinafter described, and defined in theclaims.

The invention is illustrated in the accompanying drawings, wherein likenotations refer to like parts throughout the several views.

Figure 1 is a View in side elevation, showing my band-cutter and feederin working relation to a threshing-machine, only the receiv- 0 ing orforward end of the thresher proper being shown. Fig. 2 is a verticallongitudinal section taken centrally through the band-cutter and feederas shown in Fig. 1 in the same relation to the threshing-machine proper.

Fig. 3 is a view corresponding to Fig. 2, but on a much larger scalethan Fig. 2, with some parts broken away and other parts shown in adifferent position than shown in Fig. 2. Fig. 4 is a detail, on anenlarged scale, taken in section 011 the line 56 0c of Fig. 2. Fig. 5 isa View corresponding to Fig. 4, but with some parts removed. Fig. 6 is adetail in vertical section, taken lengthwise of the deck-section 78,which delivers direct-1y to the threshingcylinder and concave. Fig. 7 isa view in perspective, showing the toothed retarding cylinder or rollerdetached. Fig. 8 is a vertical longitudinal section taken centrallythrough said retarding-cylinder shown in Fig. 7, with some parts brokenaway and others Fig. 9 is a detail in side'elevation, I

removed.

showing the bearin gs, bearing-guides, &c., for the saidretarding-cylinder, which also embraces and supports the delivery end ofthe feeding-conveyer. I

In the trade what has been hereinbefore called the threshing-machineproper is ordinarily called a separator, andfor con venience this termwill be applied throughout the specification. Of this separator, so faras shown, the numeral 1 represents the frame and the casing; 2, theforward truck; 3, the threshing-cylinder, having its shaft t mounted anddriven in the ordinary manner by belt from the engine (not shown)running over a pulley (not shown) at the right end of said cylinder. 5represents the concave; 6, the grating extended rearwardly therefrom; 7,the pivot-rod for the concave and grating; 8, eccentric cams carried bya hand adjustable 7o shaft 9 for adjusting the concave and grating inrespect to the cylinder in the customary way. All these parts of theseparatorare of the ordinary construction.

The band-cutter and feeder is adapted to be detachablysecured t0 theseparator-in any suitable way. 7

As shown, the band-cutter and feeder has i a main frame or casing 10,which is made fast in any suitable way to the separator and is supportedtherefrom by diagonal braces 11 or otherwise. When thus secured andsupported, this main-frame casing 10 of the bandcutter and feeder isrigid with the separator.

To the main frame 10 of the band cutter and feeder is attached, by asliding and pivotal joint, the bundle-table 12. As shown, this joint isafforded by a cross-rod 14, extending through metallic straps 13, fixedto the main-frame section 10 and through lono gitudinal slots 15 in theside plates of the bundle-table 12. In Virtue of this sliding andpivotal joint the bundle-table 12 can be folded into its idle ortransporting position, as shown in dotted lines in Fig. 1, withoutstriking the draft-pole 9of the separator. It may first fold on the area and then after re ceiving an upward sliding motion be further foldedon the are z into its idle position, as shown in Fig. 1 of the drawings.When the bundle-table is in its extended or working position, it issupported at its outer end by pivoted legs 16, which fold against thebundle-table when the latter is to be turned downward and backward intoits idle position. The bundle-table has the customary side boards 17 andis also provided with a detachable center or dividing board 18,extending lengthwise thereof, as best shown in Fig. 2. Thisdividing-board 18 is provided at the forward end with a bracket 19,having a hook end 21 and an eye-arm 20 for detachably securing the innerend of the dividing-board to the main frame of the band-cutter andfeeder. an eye 23 in a rod 22, secured to bracket 28, fixed to the mainframe 10, and the eye-arm engages with the lower end of said rod 22,fixed to the main frame 10 and depending downward from the front end ofthe same. This affords two points of support for the front end of thedivider 18, which points of support are spaced apart from each other andprevent any swinging motion or lateral play of the said divider 18 atits inner end. At its outer end said dividing-board 18 is provided witha depending finger 24, which works into keepers 25, fixed to thebundletable 12, and is also provided with a handle 26 for use in anobvious manner. The rod 22, to which the inner end of the dividingboard18 is detachably secured, is shown as reinforced by a pair of rods 27,secured to bracket 28, fixed to the main frame 10.

The floor 29 of the bundle-table 12 afiords a deck which when thebundle-table is in working position stands in line with a section of thefloor in the main casing 10, which has jointed to its inner end by ahinged joint 32 a downturned or inclined floor-section 31, as best shownin Fig. 3. These floor-sections 29, 30, and 31 form a continuous deck,over which travels a feeding endless conveyer of the slatand-chain type.The chains are marked 51 and the slats 54 in the drawings. Saidfeeding-conveyer passes over sprockets 34 on the opposite ends of ashaft 33, located near the outer end of the bundle-table 12, and beyondthe floor 29 thereof, and at its inner end the said feeding-conveyerembraces a toothed rotary retarder, which, as shown, is in the form of acylinder 39, having rows of back-turned teeth 49 and headpieces in theform of sprockets 50, fixed to the shaft of said cylinder 39. The chains51 of said feeding-conveyer embrace the said sprockets 50 on the toothedretarding-cylinder and receive motion therefrom, as will later be morefully noted. The sprocket-shaft 33 at the outer end of the bundle-tableis mounted in the customary bearing-boxes 35, which in turn are mountedfor sliding movement in guideways 36 in the side plates of thebundle-table and have stems 37, encircled by coiled springs 38, heldbetween the bearing boxes and the inner ends of the guides foryieldingly holding the said shaft 33 in its outermost position, asdesired, for keeping the feeding-conveyer taut. For a like purpose theupper or overrunning fold of the As shown, the hook end 21 engagesfeeding-conveyer passes over a guide-roller 52, located directly underthe hinge or joint 32 between the deck-sections 30 and 31, as best shownin Figs. 2 and 3, and the underrunning fold of the feeding-conveyerpasses over another guide-roller 53, located forward of the roller 52,as best shown in said Figs. 2 and 3.

The teeth 49 of the retarding-cylinder 39 are arranged in rows and areturned backward or made of slightly hook shape backturned with respectto the arc of rotation at their tips. The slats 54 of thefeeding-conveyer and the rows of teeth 49 on the retarding-cylinder areso spaced and related that said retarding-teeth 49 will rise into thestock carried on the face of the feeding conveyer between the slats fortheir retarding action on the stock, and said parts are also so relatedthat when said teeth 49 withdraw from the underrunning fold of thefeeding-conveyer they will withdraw directly adjacent to the saidslats54, thereby causing the slats to have a stripping action in respectto the teeth 49 of the retarding-cylinder 39 and preventing the stockfrom winding about the said retardin g-cylinder. Otherwise stated, thefact that the retarding-cylinder 39 is embraced by the delivery end ofthe feeding-con veyer, with its rows of teeth properly spaced in respectto the spacing of the slats 54 on the feeding-conveyer, enables saidretarding-cylinder to have its retarding action on the stock, asdesired, and to be at all times kept clean or free from winding, therebyinsuring its proper action and preventing the obstructions andinterruptions which would occur if the said retarding-cylinder were notembraced by the delivery end of said feeding-conveyer.

The shaft 40 of the retarding-cylinder 39 has its ends extended throughthe side plates of the casing 10 and mounted in bearingboxes 41, whichin turn are mounted for sliding motion in arc-shaped guides 42, fixed tothe said side plates of said frame or casing 10. Within the said guides42 and underneath the boxes 41 are mounted springs 44, which tend tothrow the said boxes and all the parts carried thereby to an uppermostposition, which, as shown,may be variably determined by stoppins 45,passing through any set of perforations 46 in the sides of said guides42. To prevent accidental displacement of the pins 45, they are notched,as shown at 47, for engagement with knife-edged lugs 48, projecting fromthe upper surfaces of the boxes 41, all as best shown in Fig. 9. Thesprings 44 should be made of the requisite strength to hold theretarding-cylinder and the delivery endof the feeding-conveyer in itsuppermost position against the fixed stops 45 or the upper ends of theguides 42 against any strain which might be put on the saidretarding-cylinder for the proper cooperation with thethreshing-cylinder in the threshing action, but should be light enoughto yield, if necessary, to prevent breakage of the parts.

By reference to the drawings, especially Figs. 2 and 3, it will be seenthat the said retarding-cylinder 39 and the delivery end of thefeeding-conveyor are located near to the threshing-cylinder 3,butslightly spaced apart therefrom, and, further,it will be noted that inView of the location of the joint 32 between the deck-sections 30 and 31and the radius of the arc form of the guides 42 for the boxes 41 thespacing between the retarding-cylinderand the threshing-cylindermaybeslightly varied by adjusting the delivery end of the feeding-conveyerupward or downward by moving the stop-pins 45 into different members ofthe holes 46 in the guides 42. Otherwise stated, by adjusting theretarding-cylinder in the guides 42 its axis may be brought into or outof line with the cylinder-shaft and the deck-section joint 32, therebyslightly decreasing or increasing the spacing between thethreshing-cylinder 3 and the retardingcylinder 39 of the feeder. This isimportant for insuring the best action on the stock under differentconditions or on different kinds of stock.

Directly over the deck-section 30 is mounted an overhanging rotary bandcutter. This band-cutter is of such construction as to afford a seriesof feathering-blades 58. It is not new, but is of the type known as-theDorton band-cutter, which is fully disclosed and claimed in UnitedStates Patents No. 506,422, dated October 10, 1893, and No. 482,377,dated September 13, 1893. The actions and the advantages of this type ofband-cutter are fully set forth in the said two patents and are alsoreferred to in my own prior United States patent, No. 507,771, datedOctober 31, 1893. Detailed description of said rotary band-cutter is ofcourse not necessary for the purposes of this case; but as certain partsthereof have been numbered in the drawings their relations will benamed. The band-cutter shaft 55 has secured to its opposite ends withinthe casing 10 suitable gear-cases 56, which are connected near theirouter margins by transverse shafts 57, having fixed thereto thebandcutting blades 58, which are of such shape as to afford serratededges for the cutting action and rearwardly-projecting pointed heels forthe clearing action or returning action on the stock which mayaccumulate behind the bandcutting cylinder. WVithin each gear-casing 5.6the shaft 55 is provided with a gear 59, which mesh with intermediategears 60, turning on stud-shafts carried with the gear-casing, and whichintermediate gears in turn connect the small gears 61, carried on thetransverse shafts 57. This is the well-known sun-andplanet gearing andunder the rotary motion of the band-cutting cylinder will impart afeathering motion to the cutting and clearing blades 58, all as fullyset forth in the prior patents above noted.

Directly to the rearward of the band cutting and clearing cylinder aremounteda series of strong spring-fingers 74, which are fixed to the hoodportion of the casing 10 at their innermost ends and have their freeends so disposed in respect to the cutting and clearing blades 58 as topass between the heels of said blades and cooperate therewith to preventthe said heels of said blades from carrying back outward stock under thenormal threshing action, but to yield when necessary for permitting theheels of said blades to throw back outward an uncut bundle or mattedmass of stock which might be carried in by'the band-cutting cylinder orany excess of stock accumulating behind the band-cutter.

Directly under the delivery-section of the feedingconveycr is mounted avibrating feedpan 75, having the customary fish-back cleats 76 runninglengthwise of its feeding-surface for serving the customary function offeeding into the separator any fine stock and the grain which may fallthereon from the primary feeding devices. This feed-pan is pivoted atits outer end to a hanger 77, depending from the fixed frame 10, andreceives reciprocating motion from pitman 83, connected to a crank-shaft82, mounted in suitable beariugs on the fixed frame 10. The pitman 83connects to the pan 75 on a common center with the said pans connectionto the hanger 77. Otherwise stated, the arms of the hanger 77 areconnected by a common rod at their lower ends, which forms a part of thehanger and serves also as the connection for the pitman 83 and thevibrating feed-pan 75. This form of connection secures both a forwardand backward motion to the feed-pan 75 and an upward and downward motionto the same at its head or receiving end. This is eifective for insuringthe desired feeding action from said pan 7 5. Moreover, the fact thatthe pitrnan and the vibrating pan 75 connect to the cross hanger-rod,which unites the arms of the hanger 77, permits the feed-pan 75 tofreely turn down from the position shown in Fig. 2 into the positionshown in Fig. 3, thereby affording free access to the cylinder andconcave of the separator when so desired.

At its loweror delivery end the pan 75 when in working position rests ona detachable footboard 78, which delivers directly to the cylinder andconcave. As shown, this footboard 78 is provided with notched brackets79, adapted to engage over nutted bolts 80 for securing the samedetachably in working position, as best shown in Figs. 2 and 4. Theheads of the bolts 80 may be drawn into recesses 81, countersunk in theside boards of the casing 10 for affording clearance for the passage ofthe brackets 79 of the foot-plates 78 when so desired. The inner end ofthe board 78 normally rests on the concave 5 and is free to be adjustedtherewith. The said board 78 is detached when it is desired to.

turn the feed-pan 75 from its working position, as shown in Fig. 2, intothe position shown in Fig. 3 for access to the cylinder and As wellknown to all persons familiarwith the requirements of a successfulband-cutter and feeder of large capacity, it is desirable to drive theband-cutting and feeding mechanism,or at least the feedingmechanism,through the intermediacy of a governor, which is driven fromthe threshing-cylinder. Otherwise stated, it is essential that thefeeding mechanism at least should only operate when thethreshingcylinder is running at proper speed. The reasons for this arewell known and are fully set forth in prior patents hereinbefore noted.In the present instance I drive both the band-cutting and all of thefeeding mechanism through a friction clutchgovernor which receivesmotion from the threshing-cylinder and which is of such de-.

sign that whenever the threshing-cylinder is at proper working velocitythe band-cutting and feeding mechanism will be started with a yieldingaction and whenever the threshing-cylinder loses its proper workingvelocity the band-cutting and feeding mechanism will automatically stopuntil the cylinder recovers its proper speed. As shown, I mount on theleft end of the ban d-cutter shaft 55 a loose pulley 64: and concentrictherewith a pulley 65, which is made fast to the shaft. The pulley 64 isconnected by belt 66 to a pulley 67 on the left end of thethreshing-cylinder shaft 4. The loose pulley 64 is therefore kept inconstant motion from the threshing cylinder. Stud-shafts 68 project fromthe spokes of the loose pulley 64 and have pivoted thereto the arms 69 7O. The arms 69 have mounted thereon adjustable weights 71, and the arms70 carry at their inner ends shoes 73, adapted to grasp the periphery ofthe pulley 65, which is fixed to the band-cutter shaft 55, as abovenoted. The free ends of the arms 69 are connected by springs 72 to thehub of the loose pulley 64. This construction affords a centrifugalgovernor capable of the functions desired. It is obvious that it willgrasp and release the pulley 65, fixed to the band-cutter shaft 55,according to the speed of the loose pulley 64. Now all of the parts ofthe band-cutting and feeding mechanism receive motion directly orindirectly from the band-cutting shaft 55. Hence it is obvious thatwhenever the band-cutter stops or starts all the other connectedmechanism of the band-cutter and feeder will also stop and start. Havingregard to this drive from the band-cutter, the right end of theband-cutter shaft 55 has attached thereto a pulley (indicated, but notclearly shown, and hence not lettered) which is connected by across-belt 62 to a pulley 63,

located on the right end of the shaft 40 of the retarding-cylinder 39,as indicated in Fig. 1 of the drawings. Hence through these connectionsthe retarding-cylinder 39 and the feeding conveyer embraced thereby anddriven by the sprocket-wheels thereon will receive the desired motionsand in the desired directions, as indicated by the arrows. The

right end of the band-cutter shaft 55 is also provided with a smallsprocket 85, which is connected by a link belt 8t with a small sprocket86 on the crank-shaft 82, which imparts motion to the vibrating feed-pan75. Hence this vibrating feed-pan will only be operated when theband-cutter is in motion.

All the parts have now been specified, and it is thought that theiractions are probably clear from the detailed description. A few wordsmay, however, be of service respecting the general action of the machineas an en'- tirety.

The uncut bundles are of course pitched onto the bundle-table in thecustomary way. The feeding-conveyer will then carry up the uncut bundlesuntil within reachof the blades 58 of the rotary band-cutter. Theunderlying deck 30 will afford the necessary base of resistance for theproper actionof the bandcutter on the uncut bundles. Under the action ofthe band-cutter the bands will be out, and not only so, but in view ofthe feathering action of the blades 58 the cut bundles will be more orless opened up and more or less split lengthwise of the originalbundles, with the top layers shifted inward toward thethreshing-cylinder. Otherwise stated, the band-cutter acts not only tocut the bundles, but with an endwise stripping action on the cut bundlesshifting forward the upper strata over the lower, thereby thinning thestrata on the section of the conveyer between the band-cutter and thethreshing-cylinder. This stripping action, started by the band-cutterand feeder, is then continued under the cooperation of thethreshing-cylinder 3 of the separator and the retarding-cylinder 39 ofthe feed mechanism. Otherwise stated, when the strata of stock on thedelivery-section of the feeding-conveyer becomes subject to theretarding-teeth 49 of the retarding-cylinder 39 the underlying strata ofthe stock will be withheld, while the overlying strata will shiftforward under the pull from the rapidly-running threshing-cylinder 3. Ifany of the stock happens to be matted together or tangled up in any way,it will be caught and held by the retarding-fingers, while at the sametime it is subject to the teeth of the threshing-cylinder, and this willinsure the tearing apart of the tangled stock and the admission of thesame to the threshing-cylinder in the best condition for the threshingaction, so far as the feeding is concerned. Even if an uncut bundleshould by accident pass the band-cutter and not be thrown back forwardthereby, but permitted to pass inward to the delivery-section of thefeeding-conveyor, it would be cut by the teeth of the retardingcylinderand held until the band would be broken and the bundle successivelystripped under the action of the threshing-cylinder. This assumes, ofcourse, that the springs 44 underlying the boxes 41, which carry theshaft of the retarding-cylinder, are of the proper tension to withstandthe necessary strain for such desired action under the oooperation ofthe retarding-cylinder and threshing-cylinder on such a body of stock.

If there should be an excessive amount of stock drawn in by theband-cutter beyond what was being fed by the feeding-conveyer and theretarding-cylinder, it will tend to accumulate between thethreshing-cylinder and the band-cutter until the pointed heels of thefeathering-knives 58 of the band-cutter will engage therewith and throwthe excess back outward onto the bundle-table in front of theband-cutter in the same Way as described in the prior patentshereinbefore mentioned. The difference over the prior patents in respectto this clearing action is the presence of the spring-fingers 74,cooperating with the band-cutter to prevent back throw under normalconditions, but yielding to permit an uncut bundle or other excess to bethrown back outward when necessary.

From the foregoing description it must be obvious that I have provided aband-cutter and feeder of highly-efficient form designed to feed thestock with a successive series of endwise-splitting actions, as is knownto be most desirable, and that at the same time I have provided aband-cutter and feeder which is of simple construction, compact in form,and comparatively light in weight. It will of course be understood thatthe details of the construction might be changed without departing fromthe spirit of my invention.

It might be noted that the guides 42, which carry the journal-boxes ofthe retarding-cylinder 39, are formed to an are which is described by aradius having the bancl cutter shaft 55 as its center, and hence thecrossed driving-belt 62, which conveys motion from the band-cutter tothe retarder and through the latter to the feeding-conveyer, will remaintaut in all the adjustments which may be required to the delivery end ofsaid feedingconveyer. Of course it will be understood that the toothedretarder in its relation to the feeding-conveyer constitutes ahighly-efficient feeder which is capable of use on headed or uncut grainwithout the presence of the band-cutter. In fact it has been so used byme in practice for that class of work.

By actual usage under the most severe conditions-to wit, on threshers oflarge capacity when crowded to their limit, as is the custom in thehard-wheat belt of the North westI have demonstrated the efficiency ofthe band-cutter and feeder herein disclosed. All statements herein madeas to the action of the parts are based on field experience with workingmachines constructed as here in described.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

1. In a feeder, the combination with a feeding-conveyer, of a toothedrotary retarder, em braced by the delivery end of said feedingconveyer,with the slats of said conveyer and the rows of teeth on said retarderso spaced and related that the retarding-teeth will rise between theslat-s of the overrunning fold of the conveyer, and into the stockthereon, substantially as and for the purposes set forth.

2. In a feeder, the combination with a feedin g-conveyer, of a toothedrotary retarder, embraced by the delivery end of said conveyer, with theslats of said conveyer and the rows of teeth on said retarder so spacedand related that the retarding-teeth will rise between the slats of theoverrunning fold of the conveyer into the stock thereon, for theirretarding action on the stock, and that said retarding. teeth willwithdraw from the underrunning fold of said conveyer adjacent to saidslats, whereby the slats strip the teeth and prevent the stock fromwinding about the retarder, substantially as described.

3. In a band-cutter and feeder, the combi-' nation with an overhangingrotary band-cutter having feathering-knives,substantially as described,of a feeding-conveyer underlying said bandcutter and overrunning a deckwhich affords a base of resistance to the said band-cutter, and atoothed retarding-cylinder ha ving sprockets engaged by the chains ofsaid conveyer at its delivery end, with the slats on said conveyer andthe rows of teeth on said retarding-cylinder so spaced and related thatsaid retarding-teeth will rise into the stock between the slats of theconveyer, and will with draw from the conveyer against the slats, allsubstantially as and for cooperation with the threshing-cylinder andconcave, as set forth.

4. In a feeder, the combination with a feeding-conveyer havingadelivery-section which is adjustable to bring the delivery end thereofnearer to or more remote from the threshing-cylinder, of a rotaryretarder embraced by the delivery end of said feeding-conveyer, with theslats ofv the conveyer and the rows of teeth on the retarder spaced andrelated as described for the retarding and the clearing actions, asstated, and which retarder is mounted for adjustment with the deliveryend of said feeding-con veyer relati veto the threshing-cylinder, forcooperation with the threshing-cylinder, as described.

5. In a band-cutter and feeder, the combi nation with a rotaryband-cutter, of springfingers cooperating therewith to prevent thereturn of stock under the normal feeding actions, but yielding to permitthe return of stock to the front of the band-cutter when desired forthrowing back outward uncut bun dies or other overaccumulations of stockbehind the band-cutter.

6. The combination with the rotary bandoutter having thefeathering-knives with pointed heels as described, of the underlyingfeeding-conveyer and deck-sections disposed substantially asdescribed,the toothed retard ing-cylinder having sprockets embraced bythe chains of said conveyer with the slats of the conveyer and the teethof the retarder spaced and related as described, and both the Intestimony whereof I aifix my signature delivery end of the conveyer andthe retarder in presence of two Witnesses. adjustable together to Varythe distance betweentheretarderand thethreshing-cylinder, JAMES 5 andthe spring-fingers 74: coperating with the \Vitnesses:

feathering-knivesof the band-cutter,suhsta11- 0. II. LEONARD, tially asdescribed. II. W'. JOHNSON.

